Data - Data communication service

Nowadays We often use wifi technology for internet. The purpose is exchanging the data without physical  line. And the baud rateid is different from wide band or narrow band.

Data

The image from http://blog.ecosmart.com/

Data is used in science field or a thing that can visualize with number. The figure indicate a  Characteristics of the light  wave. Every color  has several band from wide to narrow.